Weighing mechanism



Sept. 15, 1925'. 1,553,788

, H. L. MERRxcK WEIGHING MECHANISM ned/oct. 26, 1921 2 sheetsheev. 1V

(qu uen to@ Sept. l5, 1925.

H. L, MERRICK WEIGHING MECHANISM 1921 2- Sheets-Sheet 2 Filed Oct. 25

Patented Sept. 15, 1925.

UNlTED STATES HERBERT L. MERRIGK, OF PASSAIC, NEW JERSEY.

WEIGHING MECHANISM.

Application filed October 26, 1921. Serial N'o. 510,454.

liiechanisml of which the following is a spei cation.

luis invention relates to weighing mechaeinliloying a steel yard or scale beam d to be influenced by a load being g and in which the beam is brought inn equilibrium by the adjustment of a poise weight upon the beam to counterbali ance a load7 said poise weigrit co-operating with graduations on a scale beam to indicate the weight of a load, and it is the object of the invention to provide improved means controlled by the deflection of the scale beam to automatically adjust the poise weight upon the beam to bring the beam into eipiilibriuni and to counterbalance a load being .veighed.

carrying out the invention l provide ciallv supported scale beam arranged load supporting means connected to pid and having a poise weight adjustniounted on the other end, a friction i en wheel being mounted upon the beam s- Vfort lo rotate ou an anis perpendicular i longitudinal airis of the beam and in ne coincident with the pivotal plane e beam and having a connection with fp-oise veight to adjust the poise weight i the ii tation of said friction wheel, on driving surface traveling in a tion parallel with the axis of the driven wheel when the beam is in equilibrium and relative to which the plane of rotation of the wheel is adapted to be varied by and in accordance with the deflection of the beam from equilibrium to underload oL A Wei-load position to rotate and control the direction of rotation of the driven wheel and thereby the adjustment of the poise weight upon the beam.

.lu the drawings accompanying and forming i: part of this specihcation, Figure l is i n view of weighing mechanism illusi g; an embodiment of my invention to aiaon atically adjust the poise weight to bring the weighing mechanism into equili 'um to counterbalance a load being weighed, only so much of the weighing mechanism being shown as is essential to an understanding of the invention.

Figure 2 is a front elevational view of Figure l.

Figure 3 is an end elevation looking at the right of Figure l with the scale beam in section.

4Figure 4 is a perspective View, partly in section, of the means to automatically adjust the poise weight when the weighing niecl'ianism is moved out of equilibrium to bring the mechanism in position to counterbalance or weigh a load.

Figure 5 is a perspective detail view showing in a diagrammatic manner the relation of the driven friction wheel of the poise weight adjusting means in relation to the friction driving surface therefor.

Figure 6 is a detail sectional view to illustrate in a diagrammatic manner the angular position to which the friction driven wheel is changed relative to the friction driving surface when thel beam is moved to underload position to drive the friction driven wheel to adjust the poise weight to bring the beam into equilibrium.

Figure 7 is a view similar to Figure 6 but showing the angular position to which the friction driven wheel is changed relative to the friction driven surface when the beam is moved to overload position to drive the friction driven wheel in a direction reverse to that shown in Figure 6 and to ad just the poise weight in opposite direction to bring the beam into equilibrium; and

Figure 8 is a cross sectional view to show the mounting of rollers upon the periphery of the wheel to rotate on an axis extending circumferentially of the wheel.

Similar characters of reference designate like parts throughout thel different views of the drawings.

l have shown in the drawings an embodiment of the invention in connection with a platform scale or weighing mechanism in which a load receiving platform (not shown) is connected by a rod 8 to a shackle 9 for the engagement of knife edge pivots il() project-ing laterally from opposite sides of the scale beam 11. The scale beam is carried by a frame l2 comprising a pair of parallel spaced members connected at opposite ends and pivotally supported upon bear ings mounted upon standards 13 by knife edve pivots la extending between parallel members l5 rigid with and extending at right angles to 'the spaced members of the frame l2 and to one of which members the scale lie-nn l2 ie lined between its ende` as shown 1n the i draw nga, the load. receiving plati'orin being een eeted to the benin at one side ot the pivotal snppi of its carrying` traine i poise Weignt i6 is mounted fion a roller earriaoe 'il' inountel uien ineke lt opposite sides oi the leeani to diagonally t iere'troni and lined a 1 to the end oit the scale he is aryznged with 'aduations 'with which the poise weight eo-operzites to indicate the weight oi' the load.

t its oppo- To adjust the poise weight upon the stale benin to bring the weighing inet-hanisln into equilibrium to CounteL l load, or to bring the beam to initial posi-- tion et eqif'libriuin when the load is renioved, a trietion driven disl; 70 is inounted between lugs 2l proj eeting laterally from the members of the beam supporting` traine l2 to rotate on an axis perpendie l o the longitudinal nxif; oit the Scale benin and in- 'erseeting the pivotal support et the Hearn and in a pinne with the pivoil plane o'2 the Scale heain. This disk is opel conn eted to the poise weight whefe y the disk is rotated longitudinal movement. will he imparted to the 'poise weight to ad iiet the latter upon Vthe beam, this e mineel tien in the present instance Comprising a lz-elt or cable 22 Connected opposite ende to the poise weight, as shown in if'ignres and 2, passing` around pulleys E23 supported at opposite ones of the scale bearn to 'otate on axes perpendicular to the longitni inal axis of the heain, and looped ironnil I l or sheave f-i rotatable with the l. offieel l l k Y of rollers (Figuren o to q.,

around, the periphery of the disl: ,e atahle on an axis extending; eiren Yntially ar und the periphery el the dieli. or this purpose the rollers are mounted on pivot pine or studs' 2G in een- 2? in the periphery of the disk, the t 'the pins engagiiu in filete 2T in l wells oi" the adjacent rev-"elses FZ? Ygained therein by pins or s Y ne :it 'lhe rolle oi n sii/n to hat tapered to f t :I: and are i eaeh and no that the outline of all it the rollers Snhetantielly eoinidee with the if" Ainscribed periphery ot the digli'. The dish' elA 2O ie rotated hy a traveling' friction Surlaee sind Shown as eoniprisingr a belt 2.() passing around a pulley 30 vtied to a Shaft 3l jonrnalled in a .stainilerd 32 and around :z pulley 33 rotatably carried et one end ot en arin 3ft pivotally ,supporter at the oppoeite end to one ot the standards 123, as eliown at 3353, whereby the pulley 32B .is Sup ported hy the belt and the weight of saut pulley serves lo maintain the Height ot the lielt tant. it will he noted that. the pulley or `he dist( the it, et-ional etnitaet oil the belt leerte sides t e roller at i of me diei: without imparting to the diei; its the 1 L will rotate such rolA r any rotative movement driv ift) will in Meara )tation ifnafion oi sneli relaiion to the lt and the l'oree nient ot' the belt will impart axial thrust to the rollers Vwith which. Al e belt is in Contact und will in'lpart roi inoveinent to the disk in the diree t en :h thrust and Sueh movement ol 4-itetl to the poise wel .movingthe poise weight ot the be holt :he beam. "he angular relation of eli to the eelt is eliane'ed liv and in 'Y L i n 1. l. .if ,ne-e, with the movezneni or i uleetioii :erle laeari; oit ol equililwiun to `i or uiiderload position.

in its nornnil position i u pivotal support ot the henna. Riir u load to have been ieposefl npozi hing;l meelninistin and the t "iduateil the Seale lieain is moved i ipivarll varying' the angular relation ot the disk to the heit, Shown in Figure 'l' with the helt. trave ling,r in the direetion in :rf/el the arrow moving` the poise wei r out` he oeain fr" lv ward on the heain. .sin ti elly brin it to eonntei'loalaneing p or equilibrium such niovei poiee weight the angular d to the belt will gradually changed until the diei-.1 will he in position to rotate on an axis in a plane with the divertirvi. et travel ot the heil and no 'turther in en t fr,

the beltdiaerr" in Figure (l when the he# 'torce upon the rollnfe 2 indi in the dlref'tion entes: ui-e (l and rin-.reine Seid v ,t no

(liek ailviueted to ille pos i ,a 1,- ligue l therely moving` the poiee weight neaavae in an opposite direction on the beam and toward the pivotal support thereof to positiou to bring the beam into initial position of equilibrium.

o cause the belt to positively engage the rollers L5 and rotate the dish 2O when the beam is moved out of equilibrium means are provided to forcibly press the belt against the rollers Q5. For this purpose rollers 37 are rotatably mounted in the bifurcated eifds of arms 3S to engage the outer surface of the belt at opposite sides of the dislt. These arms are lifted to rock shafts 89, 40 extending longitudinally of the scale beam and rotatalily supported in brackets 4l mounted `upon men'ibers 42 or channel shape in cross section. These shafts are rocked in a direction toward each other to move the roller carrying arms 38 inward toward the opposite stretches of the belt by means actuated by either one of a pair of arms 43, 44 fixed to and extending downward from adjacent the outer end of the scale beam with the free end of one arm, as 43, to engage above one end of a lever 45 pivotally supported by a bracket 46 fixed upon a member 42, and the other arm 44 having the end bent laterally to entend below the opposite end of the lever 45. rllhis lever is connected at one side of its pivotal support by a link 47 to one end of a lever 48 fixed to the shaft 40 the other end of the lever 48 being pivotally connected to an arm 49 fified to the shaft 39. lt will be obvious that as the beam is moved uowuward or to underload position that the arm 43 will engage the lever 45 moving the link 47 and the connected end of the arm 48 upward thereby rocking the shafts 39, 40 to move the rollers 3'4" inward into forcible engzigeiiieiit with the belt and the pressure with which the rollers 3'? will engage the belt will be gradually diminished as the beam gradually comes into position of equilibrium by the adjustment of the poise weight thereon. lfhen the beam is moved upward or to overload position as by the imposing of a load upon the weighing mechanism the lateral projection of the arm 44 engaging below the one end of lever 45 will move said lever in the same direction as the arm 43 roel-:ing the shafts 39, 40 to move the rollers 37 into eut agement with the belt.

The fric/,ion driving surface 29 is continuously driven from a suitable source of power, and as shown is driven by an electric .motor (designated in a general way by lvl) mounted upon a bracket 50 fixed to the standard 32, and operatively connected to the friction driving surface through a belt 5l passing around a pulley 52 on the motor shaft and a pulley 53 fixed to the shaft 3l.

It will be obvious that the poise weight need not be first returned to position to bring the scale beam to initial position of equilibrium before the successive load may be weighed but that a successive load may be applied to the weighing mechanism as a load previously weighed is rei .oved whethersuch successive load is of greater or less weight than such previous load.

it will also be noted that the poise weight adjustable upon the beam to co'unterbaiance load being weighed in a manner similar to that of ordinary hand weighing, but that the poise weight is automatically moved to correct counterbalancing position, and that when the load is removed from the hing mechanism the poise weight is automatically adjusted to bring the scale beam into initial no-load position.

Having thus f claim:

l. in weighing mechanism, the coi'nbination with a scale beam arranged with load supporting means7l of a poise weight adjustable on the beam5 a travelling member having friction surface; and a rotatable member to contact with the friction surface of said travelling' member operr"ve to adiud, the poise weigl'it through the rotation of iaid rotatable men'iber, said rotatable r anbei l* ing normally positioned to rotate on an parallel with the direction of travel of f friction traveling ember when the beam is in equilibrium and the airis rotation of sa d rotatable member being adapted to be varied in angular relation to the plane of travel of the traveling friction member by and in accordance with the deflection of the beam to underload and overload position to rotate and control the direction of rotation said rotatable member and the adjustment of the poise weight upon the beam.

2. lin weighing mechanism5 the comlfiiuation with a scale beam arranged with load supporting means of al poise weight adjustable on the beam to counterbalance a load supported by the beam; a travelling belt: a rotatable friction member having an operative connection with the poise weight to adjust said weight through the rotation of the friction member, said member normally rotating on an axis in line with the direction of travel of the belt when the beam is in equilibrium and the axis of rotation of said member being adapted to be varied in angular relation to the travel of the belt by and in accordance with the direction of deflection of the beam to rotate and control the direction of rotation of said rotatable member and thereby the adjiistment of the poise weight upon the beam for the purpose specified.

3. lin weighing mechanism, the combination with a scale beam arranged to support a load herefrom, of a poise weight adjustable on the beam to counterbalance a load supported tl'iereby; a retable friction member having an operative connection with the poise weight to adjust said weightupon the ,.'ibed invention Sii beam through the rotation ot said jiriction nieniber; ani.. a trai'elin.Le belt arranged with oppositely moving stretches to irictionallyy engage said rotatable menibcr ior the purpose specii'ied.

'in weighing mechanism7 the combination with a ,scale beam, of a poise weight adjustable on the beam to counterbalanee the load being;` weighed; a member haring: a friction surface travciingj in a constant di rection; a iriction member normally positif ed to rfiaate on an a Irarallel witl'i the direetion ot' if triction sur'i'face o1 the tiret member when the beam in equilibriuin5 and the anis ot rotation oi. 'd rotatabie member beingv travel ot the `first y in accordance with the direetion oi the detection oit' the bean'i to rotate and control the dii-f tion ot rotation ot' said rotatable friction nieii'iber; aneL means to operatively eoniiect the rotatable friction member to the poise weight to adiust the :fame upon the beam through the rotation ot said iiriction member.

5. in weighing mechanism7 the combination with a scale beam, of a poise weight adlinstable on the beam to counterbalance a load being` weighed; a tiiwelingl belt; a friction driven wheel connected to the beam all positions of the latter and arranged to be 1i" ctionally engaged by opposite stretches oi the belt, said wheel being@` adapted to rotate on an axis parailel with the direction of trarel oi? the belt when the beam is in equilibriinn with the wheel maintained inactive7 and on an at varying' angular relation to the direction ot travel of the beit by and in accordance with the direction oi deflection ot the beam to rotate and control the direction ot rotation ot the wheel; and means to operatively connect the wheel to the poise weight to transmit thc rotative movement oi? the wheel to said weight t'or the purpose spec-ined.

6, in weighing` mechanism, the combination oi? a scale beam supporting` iframe; a poise weight adjustable on the beam to counterbalance a load beinO` weighed; a friction wheel carried by said 'trame to rotate in a plane coincident with the plane of the beam; a traveling.;` sarta-ce to trietionally engage the wheel; said, wheel when the beam is in eipiililzlrinn'i having` its plane ot' rotation at right angles to the direction ot travel ot :aid surtaf'c and the wheel maintained in active7 and the angle between the plane ot rotation ot said wheel and direction ot travel ot the surface being adaptedL to be varied by and in accordance with the direction of deilection ot the beam to trictionally rotate the said wheel from said surface and control the direction of rotation oitl the wheel; and an operative connection between said wheel and poise Weight t'or the purpose specified.

aily engage said whcei tor the purpose specii'r'iQCh 8. ln weighing mechanism, the combination oit a pivotally supported scale beam; poise weight` adjustable on the beam to counterbalance a load being;` weie'liei,Y g a rotatable `i'riction wheel; a belt arrai'ipel with the oppositely movingstretches thereol at opposite periplieral portions oit' the wheel; means operative by the deflection of the beam to maintain said belt in engagement with the wheel to irictionally rotate the latter; and means to connect the wheel to the poise weight to transmit the rotative movement ot said wheel to the poise weight to adjust the same upon the beam.

9. ln weighingmechanism, the combination o' a scale beam; a poise weight adjustable on the beam to counterbalance a load being weighed; a rotatable dish; a belt with oppositely moving stretches arranged to engage at opposite peripheral portions ot the disk and travelingv in a direction coincident with the axis of the disk when the beam is in equilibrium; a series ot rollers disposed around the periphery oi the disl; to rotate on an' axis extending circun'rterentially ot the dish7 said rollers adapted to be 'frictionally rotated by the belt when the bean] is in equilibrium without imi'iarting n'iovcment to the disk and adapted to have axial thrust imparted thereto by the movement ot' the belt and rotate the disl; when the beam is dei'lected causing;` a change in the angular relation between the axis ot the disk and belt; and means to impart the rotary movement oit the disk to the poise weight for the purpose specified.

l0. ln weighing' ineehanisn'i7 the combination ot a pifoted sca-le beam; a poise weight adjustabie on the beam to coiinterbalance a load being' weighed; a Vricton driven dish` carried by the i'ieam: a belt to triclionally rotate said dish; a wheel rotatable with the disk; and a belt passing around said wheel and wheels rotatably carried at oppositie ends oit the beam and connected to the poise weight to impart the rotative movement ot the disk to said weight to adjust the same longitn linally upon the beam 'for the purpose specitied.

il. .in ii'eiighingr meehanisn'i, the combination ot a scale beam7 a frame carryingsaid lll) las

beam supported to have movementon an axis extending trausversclj7 of the scale beani, a poise weight adjustable along' the beam, a friction driven disk mounted in said frame to rotate on an anis iiitersecting the anis of the frai'ne, continuously driven friction means to frictionallj7 engage said disk without imparting movement thereto when the beam is in equilibrium and adapted to rotate the disk when the beam is moved out of equilibrium, and a connection between said disk and poise weight to adjust the latter along the beam when the disk rotated for the purpose specified.

12. ln weighing mechanism, the combination of a pivotally supported scale seam; a poise weight adjustable upon the beam; a rotatable friction driven disk rotatable in a plane parallel with the beam in all positions thereof; constantlyY driven friction .means to frictionally engage and rotate said disk when the beam is moved out of equilibrium; and a connection between said disk and poise weight for the purpose specified.

Y`3. ln weighing mechanism, the combination of a scale beam; a poise weight adjust able on the beam to counterbalance a load beingl weighed; a rotatable friction disk; means to connect said disk to the poise weight to adjust the latter upon the beam through the rotation of the disk; a belt with the opposite stretches arranged at opposite peripheral portions of the disk; and means operative when the beam is moved out of equilibrium to force said belt into frictional engagement with the disk to rotate the disk for the purpose specified.

lll. ln weighing n'iechanism, the combination of a scale beam; a poise weight adjustable on the beam to counterbalance a load being weighed; a rotatable friction disk; means to connect said disk to the poise weight to adjust the latter upon the beam through the rotation of the disk; a belt with the oppositely moving stretches arranged at opposite peripheral portions of the disk; rocker arms carrying rollers to engage at the outer surface of the belt; and means opera-tive when the beam is moved out of equilibrium to rock said arms to force the belt into frictional engagement with the disk for the purpose specified.

l5. ln weighing mechanism, the combination of a scale beam; a poise weight adjustable on the beam to counterbalance a load being weighed; a rotatable friction disk; means to connect said disk to the poise weight to adjust the latter upon the beam through the rotation of the disk; a 1ielt with the opposite stretches arranged at opposite periph rtl portions of the disk; rocker arms carrying rollers to engage t i the outer surface of the belt; a lever havin a connection with said rocker a msg an abutments carried b v the beam arranged when the beam is moved out of nquilibrium to actuate said, lever to rock the arms to force the belt into frictional engagement with the disk to rotate the same for the purpose specified.

i6. ln weighing mechanism, the combination of a scale beam; poise weight adjustable on the beam to counterbalance a load being weighed; a rotatable friction disk; means to connect said disk to the poise weight to adjust the latter upon the beam through the rotation of the disk; a belt with the opposite stretches arranged at opposite peripheral portions of the disk; a pair of rocker shafts extending longitudinally of the scale beam; an arm tired to each of said shafts carrying rollers to engage at oppositel sides of the outer surface of the belt; av lever; a second lever lined to one of the shafts and having a pivotal connection at one end with the one end of the first lever; and an arm lined on the other shaft having a pivotal connection with the opposite end of the second lever; and a pair of arms fined to the outer end of the scale beam arranged so that one of said arms when the beam is moved out'of equilibrium will engage with the first lever and rock the shafts in opposite directions through the connection thereof with said lever and thereby move the arms to force the belt into frictional engagement with the disk for the purpose specified.

17. In weighing mech anism., a scale beam; poise weight adjustable on the beam to counterbalance al load being` weighed: a member having a friction surface traveling in a constant direction; a rotatable friction member in constant contact with the traveling friction member and having its axis angularly adjustable to the direction of travel of the traveling friction surface; and means to connect the rotatable friction member vith the poise weight to adjust the poise weight longitudinally on the beam by the rotation of the rotatable friction member.

Signed at city of New York in the county of New York, and rtate of New York this 21st day of October, 1921.

HERBERT L. MERRCK. 

